linux-kernel - Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when COMPILE

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Message-ID: <5525992C.6090906@nod.at>
Date:	Wed, 08 Apr 2015 23:10:04 +0200
From:	Richard Weinberger <richard@....at>
To:	Chen Gang <xili_gchen_5257@...mail.com>, realmz6@...il.com
CC:	adi-buildroot-devel@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blackfin: Makefile: Skip reloc overflow issue when COMPILE_TEST
 enabled

Am 08.04.2015 um 23:05 schrieb Chen Gang:
> l1_text is at L1_CODE_START (e.g. for bf533, 0xff800000). If the kernel
> is too big, it may be overwritten, the related issue:
> 
>     LD      init/built-in.o
>   init/built-in.o: In function `do_early_param':
>   init/main.c:(.init.text+0xe0): relocation truncated to fit: R_BFIN_PCREL24 against symbol `strcmp' defined in .l1.text section in arch/blackfin/lib/lib.a(strcmp.o)
>   init/main.c:(.init.text+0x10e): relocation truncated to fit: R_BFIN_PCREL24 against symbol `strcmp' defined in .l1.text section in arch/blackfin/lib/lib.a(strcmp.o)
>   init/built-in.o: In function `unknown_bootoption':
> 
> blackfin is for embedded system, the size limitition is acceptable, so
> it is not the real world issue, which should be skipped if COMPILE_TEST
> enabled.

You're again papering over the real issue.
COMPILE_TEST is only one way to generate a too big kernel.
The right thing is to blow up and warn the user.

Thanks,
//richard
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